thanks for the link. I've read some about this carb, as far as the mixture screws, I must not have the original metering block because turning the screws in will kill the motor. once I start it today I'll try to lean it out a bit with the mixture screws. I've tried adjusting the screws with a vac gage and the tach, always end up at 1 1/2 - 1 3/4 out for highest idle. Need to find some zinc additive before I start it, ran out of the comp cams additive I've been using.